Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
OPERATING EXPENSES
Research and development	$ 6,514	$ 7,174
General and administrative	7,007	9,232
Sales and marketing	1,681	2,443
Total operating expenses	15,202	18,849
Loss from operations	(15,202)	(18,849)
OTHER EXPENSES, NET
Interest expense, net	(216)	(217)
Unrealized loss on marketable equity securities	(427)
Other income (expense), net	91	(309)
Total other expenses, net	(552)	(526)
NET LOSS	$ (15,754)	$ (19,375)
Basic and diluted net loss per share	$ (0.42)	$ (0.64)
Weighted average shares outstanding: basic and diluted	37,850,000	30,195,000